Seiko Cal. 3894 - 550

The 3894-550 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3894 caliber with 20j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-fe916bfea1cd]

Also known as: Tuna, Bullhead

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1986

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